So far I'm unable to get my main RPi2 to fail with the D80, with 20+ prints.

Fedora 25 w/ RPI-patched 4.9.11 kernel, ethernet unplugged, and the USB ports populated by two isl3887 WLAN adapters, a Microsoft USB keyboard dongle, and of course the printer itself. The RPi2 also had an external DAC attached and was being supplied by a high-current +5v supply.

I'll try this going through a hub next, as that supposedly made the D70 problem worse.

(The EK305's seen even more prints on this RPi, but with Fedora 23 and an older kernel)

Still unable to trigger this problem on my setup with a D80. But I need to now correlate the kernel cmdlines between my setup and those that fail -- both the cmdline and the RPI's config.txt. So it's time to gather logs.

No printer failures, but I've managed to completely wedge the USB subsystem a couple of times now..